Staybolt structure



y 16, 1933- ,J. KINDERVATER I 1,909,108

STAYBOLT STRUCTURE Filed Nov. 2' 19:51

OR JZI/I US K 'nde .Vafer Patented May 16 1933 .mmus xmnxavama, or GREAT-NECK, EW xonx STAYIBOLTY STRUCTURE I a ai aiibn'nied; November 2, 1 931.} steam. 572,564.

I This invention relates to fiexibl'estaybolt structuresqof the type com rising a sleeve adapt'ed't'o' be attached to a oiler shell, and

formed with an internal spherical seat; a

i bolt member formed with an enlarged head adaptedto fit within the sleeve and having a spherical facebearing on the seat; a cap at the end of the sleeve; and a diaphragm disposed on the sleeve around the head, pro- 19 viding a seal between the bolt and sleeve against the escape of steam.

The object of the present invention is to provide an improved staybolt structure of the type described, which will effect an efiioient steam tight joint between the sleeve and the bolt member, and which will permit the widest possible range of turning movement of the bolt head, while imposing the slightest possible undesirable stresses on the diaphragm.

A further object is to provide a staybolt structure of the type described comprising an improvedv diaphragm which is characterized by greater flexibility and consequently will be of increased durability.

' The invention isv illustrated in the accompanying'drawing, in which Figure 1 is a side view, in elevation, of a staybolt structure embodying the invention, applied to the shell sheet and fire box sheet, of a boiler;

Fig. 2 is a view, in central vertical section,

on an enlarged scale, of the outer end of the staybolt structure shown in Fig. 1; Fig. 3

is a side View, in elevation, of the outer end of the staybolt; Fig. 4 is a plan view of the staybolt; Fig. 5 is a planview of one-half of the sealing diaphragm; and Fig. 6 is a sectional View on the line VI-VI of Fig. 5.

. In the practice of the invention, referring descriptively to the specific embodiment thereof which is herein exemplified, the staybolt structure comprises a bolt 1, having a threaded end portion 2, which is screwed into athreaded opening 3, in a fire box sheet 4.

The inner end of the bolt is cut ofi after the bolt has been screwed into lace, and

p the portion disposed on the inside of the fire box sheet is riveted, to provide ahead 5, which looks the bolt to the fire boxsheet'. The outer end of the bolt 1, is provided with an enlarged head 6, comprising a s herical face 7 and extends through" a s eeve 8, which is disposed in an opening 9, in the boiler shelllO. The sleeve ,8 is secured in place in the usual manner by welding 11. The innerend of the sleeve 8 is inwardly curved, and the inside of the sleeve, at its inner end, is slightly, outward ly tapered at 12'to provide clearance between the sleeve and the bolt. 'The radius for the outeraxially'curved surface of the sleeve is struck] from a center beyond the center lllle" of the bolt. 'A spherical seat 13 is formed'on the inner surface of the sleeveand the spherical face 7 of the bolt is adapted to engage the same andto have a relative ball and socketmovement therewith. The

provided. 'The upper end ofthe head 6 of the bolt is provided with a reduced threaded extension 1 5, and an annular clamping face 1 6 is formed cross-axially of the bolt at 'the inner end of the reduced extension 15. The diaphragm 14 is 'rovided with a central opening 17 throug which the extension 15 passes, the diaphragnnaround the periphery of its opening, resting upon the clamping face 16; A washer 18 is disposed over the diaphragm and a nuti19 is screwed on the extension 15 overthe washer, thus clamping the inner portion of the diaphragm securely tothefacel6.

,Thediaphragm 14 com rises a laminated structure formed of ap urality' of layers 14a, 14b andl l (Fig. 6), suitably pressed together, and toprovide free movement of the diaphragm so as to permit the headed portion of the bolt to assume a wide range of turning movement on the seat of the sleeve without imposing shearing stresses on the diaphragm, a corrugation 20 is formed near the outer periphery of the. diaphragm concentric with the axis-thereof. The outer rim of the diaphragm is clamped to the top of the sleeve 8 by a cap 21, which is provided with an inner screw-threaded face 22, which engages threads 23 formed on the exterior of the upper end of the sleeve 8. The cap is provided with an opening 24 in its top leaving the nut and part of the washer exposed. The head 6 of the bolt is dotted at 25 so as to permit a tool to be inserted to turn the bolt for the purpose of inserting or removing the same. .A telltale hole 26 is formed centrally in the bolt throughout the entire length. v

Of the essence of the present invention are the relative proportions and positions of the head of the bolt, its spherical face, and the diaphragm. The spherical face 7 on the head of the bolt is struck from a radius greater than the diameter of the bolt and having its center point 27, on the center line of the bolt, and the seat 13 is of a conforming spherical shape, as indicated by the are 28. The diaphragm 14 is substantially in the same plane as the said center point. It

1 will thus be apparent that by virtue of these positions and proportions, when the bolt moves relatively to the sleeve and the spherical face 7 slides upon the seat 13, the movement of the diaphragm will be substantially inappreciable, as distinguished from the relatively large amount of movement which would exist if the diaphragm was not in sub stantially the same plane as the center from which the spherical face is struck. .By this construction a minimum amount of movement is required of the diaphragm, so that a diaphragm of relatively small diameter may be employed, and in oaeration', the life of the same, because of t e small amount of movement required, will be increased to .a maximum duration. By providing spherical surfaces for the face 7 of the bolt and the seat 13 of the sleeve instead of straight tapered surfaces, seizing, gripping, and wedging are avoided.

While there has been hereinbefore deed for universal movement on said seat and for movement outwardly from said seat, said face being struck from a center point on the axis of the bolt, said head having a reduced portion outwardly beyond said face providing a space laterally therebeyond within said sleeve, said annular transverse diaphragm being located approximately at said center point and secured at its outer periphery to said sleeve and at its inner peripher to 'saidhead at said reduced portion, and having a bend permitting said movements of the bolt; and a backing member adjacent the outer face of the diaphragm secured to the bolt and extending across said space for supporting the diaphragm against boiler ressure.

J LIUS KINDERVATER.

scribed an approved embodiment of the instant invention, it will be understood that many and various changesand modifications may be made thereto, without departin from the spirit of the instant invention, an that all and any such changes and modifications as fall within the scope of the appended claim are contemplated as a. part of the instant invention.

The invention claimed and desired to be secured by Letters Patent is: i

A flexible staybolt structure comprising a sleeve adapted to be secured in an openingin a boiler sheet and having an inner seat; an annular transverse diaphragm associated with said sleeve; a bolt having a passageway extending longitudinally therethrough from end to end, and a head disposed withinsaid sleeve, provided with a spherical face adapt- 

